Water-Soluble Detergent Pouch Sealing With Edge Scraping

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Solution Overview

Problem

Dosing solid components into water-soluble detergent pouches often results in weak seals due to solid component entering the surrounding edge region, leading to product leakage and underfill issues, which are difficult to address with existing vacuum methods.

Innovation Solution

A process involving a scraper to remove excess solid component from the film-covered surrounding edge without contacting the film, followed by a vacuum to ensure proper sealing, forming a water-soluble detergent pouch with a solid component enclosed by a water-soluble film.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If a vacuum means is operated at high pressure and air velocity to remove solid component from the surrounding edge region, then solid component removal from the edge is improved, but solid component is removed from the cavity leading to under fill levels

Engineering Contradiction:

Improvesealing qualityVSAvoidfill level

Core Design Contradiction:

Manufacturing precisionVSQuantity of substance

Solution Approach 1:

The vacuum removal process is segmented into two distinct stages: first removing solid component from the surrounding edge region to ensure sealing quality, then optionally removing additional solid component from the cavity if needed. This segmentation allows optimization of vacuum parameters for each specific region without compromising the other.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different vacuum removal characteristics are applied to different regions: the surrounding edge region receives vacuum treatment optimized for complete solid component removal to prevent sealing defects, while the cavity receives controlled vacuum treatment that maintains adequate fill levels. This local differentiation resolves the contradiction between sealing quality and fill level.

Inventive Principle:

Principle #3Local quality

2Quantity of substance

If solid component is dosed into the cavity, then detergent composition is provided, but solid component enters the surrounding edge region causing weak seals

Engineering Contradiction:

Improvedetergent compositionVSAvoidseal strength

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

A preliminary vacuum removal step is performed immediately after dosing the solid component into the cavity. This preliminary action removes excess solid component from the surrounding edge region before the sealing operation, preventing the formation of weak seals while retaining adequate detergent composition in the cavity.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The harmful solid component that has migrated to the surrounding edge region is extracted and removed via vacuum before sealing occurs. This extraction eliminates the cause of weak seals while preserving the necessary detergent composition within the sealed cavity.

Inventive Principle:

Principle #2Taking out (Extraction)

3Manufacturing precision

If overfilling is configured to avoid underfill, then fill level consistency is improved, but solid component accumulation in the edge region increases leading to more severe sealing issues

Engineering Contradiction:

Improvefill level consistencyVSAvoidsolid component accumulation

Core Design Contradiction:

Manufacturing precisionVSObject-generated harmful factors

Solution Approach 1:

The solid component that accumulates in the surrounding edge region during overfilling is converted from a harmful factor into a manageable condition through controlled vacuum removal. The vacuum system specifically targets and removes this accumulated solid component from the edge region, transforming the potential sealing defect into a controlled process parameter that does not compromise seal quality.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This process enhances sealing integrity, reduces leakage risks, and maintains consistent fill levels by effectively removing excess solid component from the edge, ensuring reliable product performance.

Implementation Method 1

applying a vacuum to the scraped film-covered surrounding edge to remove some of the solid component from the scraped film-covered surrounding edge

Methodology Applied

Scientific EffectVacuum: Vacuum

Data Source

PatentEP4635865A1Process for making a water-soluble detergent pouch

Publication Date: 2025.10.22 PROCTER & GAMBLE CO

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AI summary

The present invention addresses the need to improve the dosing system of a solid component to a water-soluble detergent pouch. The present invention provides a process that removes (2) solid component (3) from the surrounding edge region, allows good sealing of the water- soluble film (1, 5), and reduces the unwanted removal of solid component from the cavity which can lead to this undesirable under fill level.